Contractor vs Permanent Employee

The Basic Difference

A permanent employee has a contract of employment. They receive a salary, statutory employment rights (sick pay, holiday, maternity leave, redundancy pay, notice periods), and usually workplace benefits such as a pension, health insurance, and training budgets.

A contractor provides services to a client under a contract for services. They are typically engaged for a specific project or period, they set their own day rate, and they are responsible for their own tax, pension, insurance, and career development. They receive none of the statutory employment rights that permanent employees enjoy.

The distinction matters because it affects your pay, your tax position, your financial security, and your working life. Neither option is universally better — it depends on your circumstances, risk tolerance, and career goals.

Day Rate vs Salary — The Numbers

Contractors are usually paid a daily rate, while permanent employees receive an annual salary. Comparing the two is not as simple as multiplying the day rate by the number of working days.

A permanent employee on £60,000 works approximately 252 working days per year but gets about 25 days of paid annual leave plus 8 bank holidays, meaning they actually work about 219 days. Their effective daily rate (salary divided by days worked) is about £274 per day.

A contractor charging £450 per day works only when they have a contract. They need to cover their own holiday (unpaid), sick days (unpaid), gaps between contracts, and benefit costs from their earnings. If they work 220 days per year (allowing for holiday and a couple of weeks between contracts), they gross £99,000.

But that £99,000 is not directly comparable to a £60,000 salary. The contractor still needs to cover everything the permanent employee gets for free.

The Benefits Gap

Permanent employees receive benefits that have real monetary value. When comparing contractor pay to a salary, you need to account for all of these:

For someone on £60,000, the total value of these benefits could easily be £10,000 to £15,000 per year. This is why the “15 to 20% premium” rule of thumb exists — a contractor needs to earn at least that much more than the equivalent salary just to break even.

You can model day rate to salary conversions using our day rate to salary calculator.

The 15-20% Premium Rule

A widely used heuristic says that a contractor needs to earn at least 15-20% more than the equivalent permanent salary to come out the same financially, after accounting for the benefits gap.

In practice, this means:

These are rough break-even figures. Anything above these rates represents the real premium for taking on the additional risk and responsibility of contracting. Most experienced contractors in fields like IT, finance, and engineering earn well above the break-even point, which is why contracting can be financially rewarding.

How Contractors Are Taxed

The tax treatment of contractors depends on their working arrangement. There are three main models:

Limited Company (Outside IR35)

If your contracts are determined to be outside IR35, you operate through your own limited company. The company invoices the client, receives the income, and you draw money from the company through a combination of:

• A small salary (typically around £12,570 to use the personal allowance without triggering NI)
• Dividends from company profits (taxed at 8.75% for basic rate, 33.75% for higher rate, 39.35% for additional rate)
• Employer pension contributions (tax-deductible for the company, no income tax or NI for you)

The company pays corporation tax at 25% (or 19% if profits are below £50,000, with marginal relief between £50,000 and £250,000) on its profits. The combination of a small salary, corporation tax, and dividend tax typically results in a lower overall tax rate than an employee on the same gross income.

Limited Company (Inside IR35)

If your contract is inside IR35, you still operate through your limited company, but you must pay yourself as if you were an employee. The client (or agency) deducts PAYE tax and NI before paying your company. After allowing a 5% allowance for company costs, virtually all the income is subject to employment-level tax and NI.

For many contractors, being inside IR35 through a limited company offers little financial advantage over an umbrella arrangement, while carrying more administrative burden.

Umbrella Company

An umbrella company employs you on behalf of the client. Your day rate is paid to the umbrella, which deducts employer NI, employee NI, and PAYE income tax, then pays you a net salary. You become an employee of the umbrella company for tax purposes.

Umbrella companies are straightforward and are the standard arrangement for inside-IR35 contracts. The trade-off is that your take-home pay is lower than an outside-IR35 limited company arrangement, and the umbrella takes a margin (typically £20 to £30 per week).

To compare take-home pay inside vs outside IR35, try our IR35 calculator.

Understanding IR35

IR35 is the informal name for the off-payroll working rules. It determines whether a contractor is genuinely in business on their own account (outside IR35) or is effectively an employee of the client (inside IR35).

The key factors HMRC considers include:

• Control: Does the client dictate how, when, and where you do the work? Greater client control suggests inside IR35.
• Substitution: Could you send someone else to do the work in your place? A genuine right of substitution suggests outside IR35.
• Mutuality of obligation: Is the client obliged to offer you work, and are you obliged to accept it? Ongoing obligation suggests inside IR35.
• Part and parcel: Are you integrated into the client’s organisation (email address, attending staff meetings, appearing on org charts)? This suggests inside IR35.
• Financial risk: Do you bear financial risk, such as correcting defective work at your own cost? Bearing risk suggests outside IR35.

Since April 2021, for medium and large private sector clients, the client (not the contractor) is responsible for determining IR35 status. The determination is provided in a Status Determination Statement (SDS). Small private sector clients are an exception — the contractor still makes their own determination.

The Practical Realities of Contracting

Beyond pay and tax, contracting differs from permanent employment in several practical ways:

Job Security

Contractors typically work on notice periods of one to four weeks, compared to one to three months for permanent employees. Contracts can end with little warning, and there is no redundancy pay. In a downturn, contractors are usually the first to be let go. You need a financial buffer — most experienced contractors keep three to six months of expenses in reserve.

Finding Work

Contractors need to continuously market themselves and maintain relationships with recruiters and clients. The time between contracts (often called “bench time”) is unpaid. In a good market, gaps may be a week or two. In a difficult market, they can stretch to months.

Administration

If you run a limited company, you are responsible for filing annual accounts, corporation tax returns, VAT returns (if registered), confirmation statements, and running payroll. Most contractors use an accountant (typically £100 to £200 per month) to handle this.

Professional Development

As a permanent employee, your employer typically invests in your training. As a contractor, you fund your own learning, conferences, and certifications. On the positive side, you gain exposure to multiple organisations, technologies, and ways of working, which can accelerate your skills development.

Mortgage and Financial Products

Some lenders are wary of contractors, particularly those with less than two years of contracting history. Specialist contractor mortgage brokers can help, and lenders who understand contracting will assess your day rate and contract length rather than your limited company salary.

When Contracting Makes Sense

Contracting tends to work best when:

• You have in-demand skills with a healthy contractor market (IT, engineering, finance, project management).
• Day rates in your field are significantly higher than the break-even point compared to your permanent salary.
• You are comfortable with uncertainty and have a financial buffer.
• You enjoy variety and are happy to change projects and environments regularly.
• You are disciplined about saving for your pension, building an emergency fund, and managing your own admin or outsourcing it.

When Permanent Makes More Sense

Permanent employment may be the better choice when:

• The contractor premium in your field is small (less than 15-20% above the equivalent salary).
• You value stability, predictable income, and long-term job security.
• You want to progress into management or leadership roles, which are harder to reach as a contractor.
• You rely on employer benefits such as enhanced maternity/paternity pay, generous pension matching, or share schemes.
• You prefer not to deal with the administrative overhead of running a company or managing your own tax.
• You are at an early stage of your career and would benefit from structured training and mentoring.

A Worked Comparison

Let us compare a permanent employee on £70,000 with a contractor on £500 per day working through a limited company outside IR35, assuming 220 working days per year.

After corporation tax, dividend tax, and deducting business costs, the contractor on £500/day outside IR35 will typically take home £15,000 to £25,000 more than the permanent employee on £70,000, depending on how they extract profits. Inside IR35, that premium shrinks significantly.

Model your own scenario with our IR35 calculator and day rate to salary converter.

Key Points to Remember

• Contractors need to earn at least 15-20% more than the equivalent salary to break even after accounting for lost benefits.
• IR35 status is the single biggest factor in determining a contractor’s tax efficiency.
• Outside IR35, a limited company with a salary-plus-dividends strategy is the most tax-efficient arrangement.
• Inside IR35, an umbrella company is usually the simplest option with similar take-home pay to employment.
• Contracting offers higher earning potential but less security — a financial buffer is essential.
• Permanent employment provides stability, benefits, and career progression that contracting does not easily replicate.
• The best choice depends on your skills, risk tolerance, life stage, and the contractor market in your industry.